| MacConkey agar | Medium containing peptone, lactose, bile salts, neutral red, and crystal violet used to identify Gram-negative bacilli and characterise them according to their status as lactose fermenters. Fermenters appear as red colonies while nonfermenters are colourless. (05 Mar 2000) |
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| MacConkey, Alfred | <person> British bacteriologist, 1861-1931. See: MacConkey agar. (05 Mar 2000) |